Methods for quantifying metamerism. Part 2‐Instrumental methods

Abstract

This is the second part of this series of articles, in which the experimental data described in Part 1 are used to evaluate three types of metamerism indices. The results show that the index based upon one of the three advanced colour‐difference formulae (CMC, BFD, and CIE94) gave a quite satisfactory prediction to the visual results. The degree of precision from these formulae is equal to or higher than the typical observer precision found in this study. A set of colour‐matching functions was also derived. In comparison with those of the CIE 1964 standard colorimetric observer, the new set gives closer agreement with the visual results, particularly under source D65. This new set could be used for indicating the degree of observer metamerism. Another set of experimental data was also assessed. Similar tests were conducted and the results confirm the earlier findings. The advanced colour‐difference formulae can be confidently used for evaluating the degree of metamerism for industrial applications.